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Logos of significantly overrepresented motifs in upstream miRNA sequences. Motifs are labeled m1 to m5 in each Caenorhabditis species, except for C. brenneri in which only four motifs are overrepresented. Each logo position includes the different nucleotides found at this position. The height of the nucleotide stack at a given position reflects conservation, and the height of a nucleotide is proportional to its frequency at that position. The phylogeny is from Kiontke et al. (2011).
